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Financing - Financing Activities - TXNM (Narrative) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 30, 2024
shares
Aug. 05, 2024
USD ($)
$ / shares
Jun. 21, 2024
USD ($)
Jun. 10, 2024
USD ($)
d
deferralPayment
$ / shares
Jun. 04, 2024
May 06, 2024
USD ($)
$ / shares
Jun. 30, 2023
USD ($)
Nov. 10, 2022
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Sep. 30, 2024
$ / shares
shares
Jun. 30, 2024
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
$ / shares
shares
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]                              
Common stock, no par value (in dollars per share) | $ / shares $ 0                 $ 0     $ 0 $ 0  
Forward contracts, issuance costs                         $ 1,000,000    
Forward contracts, net cash proceeds $ 198,200,000                 $ 198,200,000     $ 198,200,000    
Shares (in shares) | shares                   1,104,641 2,196,926 262,025 2,458,951 4,365,510  
Initial forward price (in dollars per share) | $ / shares                   $ 44.83 $ 40.58 $ 37.77      
TXNM 2022 ATM Program                              
Debt Instrument [Line Items]                              
Distribution agreement, aggregate value                 $ 200,000,000            
Common stock, no par value (in dollars per share) | $ / shares                 $ 0            
TXNM 2024 ATM Program                              
Debt Instrument [Line Items]                              
Distribution agreement, aggregate value     $ 300,000,000       $ 100,000,000                
Common stock, no par value (in dollars per share) | $ / shares     $ 0       $ 0                
Forward contracts, issuance costs                         $ 800,000    
Forward contracts, net cash proceeds $ 98,600,000                 $ 98,600,000     $ 98,600,000    
Shares (in shares) | shares 1,104,641 2,458,951                          
TXNM 2021 Delayed-Draw Term Loan due May 2025                              
Debt Instrument [Line Items]                              
Repayments of debt       $ 449,000,000       $ 500,000,000              
TXNM 2021 Delayed-Draw Term Loan due May 2025 | Bonds | TXNM                              
Debt Instrument [Line Items]                              
Aggregate principal amount                             $ 1,000,000,000
TXNM 2021 Delayed-Draw Term Loan due May 2025 | Line of Credit | Revolving Credit Facility                              
Debt Instrument [Line Items]                              
Interest rates on outstanding borrowings (as a percent) 5.41%                 5.41%     5.41%    
TXNM 2023 Term Loan                              
Debt Instrument [Line Items]                              
Repayments of debt       90,000,000                      
TXNM 2023 Term Loan | Line of Credit | Revolving Credit Facility                              
Debt Instrument [Line Items]                              
Repayments of debt       90,000,000                      
TXNM 2023 Term Loan | Secured Debt                              
Debt Instrument [Line Items]                              
Aggregate principal amount               $ 500,000,000              
Variable rate (as a percent) 5.81%                            
Five Point Seven Five Percent, Convertible Notes Due June Twenty Fifty Four | Convertible Debt                              
Debt Instrument [Line Items]                              
Aggregate principal amount         $ 500,000,000                    
Stated percentage (as a percent)         5.75%                    
Conversion ratio           0.0224911                  
Conversion price (in dollars per share) | $ / shares         $ 44.46                    
Conversion premium (as a percent)           17.50%                  
Number of deferral payments allowed | deferralPayment         20                    
Five Point Seven Five Percent, Convertible Notes Due June Twenty Fifty Four | Convertible Debt | Debt Conversion Terms One                              
Debt Instrument [Line Items]                              
Redemption price (as a percent)         100.00%                    
Five Point Seven Five Percent, Convertible Notes Due June Twenty Fifty Four | Convertible Debt | Debt Conversion Terms Two                              
Debt Instrument [Line Items]                              
Redemption price (as a percent)         100.00%                    
Threshold stock price trigger (as a percent)         130.00%                    
Threshold trading days | d         20                    
Threshold consecutive trading days | d         30                    
Five Point Seven Five Percent, Convertible Notes Due June Twenty Fifty Four - Option | Convertible Debt                              
Debt Instrument [Line Items]                              
Aggregate principal amount       50,000,000                      
TXNM 2021 Delayed Draw Term Loan | Line of Credit | Revolving Credit Facility                              
Debt Instrument [Line Items]                              
Repayments of debt       $ 449,000,000